OK, till now, most of all, I was talking only about poker sites and playing on it. But now I would like to talk about the software, who will help you to increase your earnings with playing in allmost all of the poker rooms. And the name of this software ir PokerOffice. This software is really very good thing when you are playing poker with unkownable opponents. It collects all the statistics about your opponent playing style, what helps you to know how they play and how you must to behave with them. Also with this software you are getting all of your own statistics.
  

The features, what this software offers:

• Real time opponent statistics and betting patterns.
• Interfaces directly with your poker table.
• Overlays statistics directly on the poker table.
• Win rate, statistics reports and graphs.
• Calculates pot odds, outs and probabilities.
• Replay any hand, tournament or session.
• Review your game and find leaks.
• Shows your opponents’ mucked cards

The best thing is that, before you are purhasing this software you can try the trial version of 300 hands for free.
Everything is fully explained on their site. And it costs only 99$ to you, but… you can get it absolutely for free! 
The site is offering to choose you a poker room from their list and if you register to the poker room throw their link and earn some poker points (not very much required) you will get the PokerOffice license absolutely for FREE! For that you must just earn some poker points and send an e-mail to their support to require a free license.
Also if you will have some troubles, you can use their forum to get a support from them.